PCF8573 Ver la hoja de datos (PDF) - Philips Electronics
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PCF8573 Datasheet PDF : 28 Pages
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Philips Semiconductors
Clock/calendar with serial I/O
Product specification
PCF8573
Table 3 MODE-POINTER-word, CONTROL-nibble (bits 8, 7, 6 and 5)
BIT 8 C2
C1
C0
FUNCTION
0
0
0
0 execute address
0
0
0
1 read control/status flags
0
0
1
0 reset prescaler, including seconds counter; without carry for minute counter
0
0
1
1 time adjust, with carry for minute counter (note 1)
0
1
0
0 reset NODA flag
0
1
0
1 set NODA flag
0
1
1
0 reset COMP flag
Note
1. If the seconds counter is below 30 there is no carry. This causes a time adjustment of max. −30 s. From the count
30 there is a carry which adjusts the time by max. +30 s.
Table 4 MODE-POINTER-word, ADDRESS-nibble (bits 4, 3, 2 and 1)
BIT 4 B2
B1
B0
0
0
0
0 time counter hours
0
0
0
1 time counter minutes
0
0
1
0 time counter days
0
0
1
1 time counter months
0
1
0
0 alarm register hours
0
1
0
1 alarm register minutes
0
1
1
0 alarm register days
0
1
1
1 alarm register months
ADDRESSED TO:
At the end of each data word the address bits B1, B0 will be incremented automatically provided the preceding
CONTROL-nibble is set to EXECUTE ADDRESS. There is no carry to B2.
Table 5 shows the placement of the BCD upper and lower digits in the DATA byte for writing into the addressed part of
the time counter and alarm register respectively.
Table 6 shows the acknowledgement response of the clock calendar as a slave receiver.
Table 5 Placement of BCD digits in the DATA byte; note 1
MSB
DATA
UPPER DIGIT
LOWER DIGIT
UD
UC
UB
UA
LD
LC
LB
X
X
D
D
D
D
D
X
D
D
D
D
D
D
X
X
D
D
D
D
D
X
X
X
D
D
D
D
Note
1. ‘X’ is the don’t care bit; ‘D’ is the data bit.
LSB
LA
D
D
D
D
ADDRESSED TO:
hours
minutes
days
months
2003 Jan 27
11
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